/ Dictionary / Index F Formosus: Meaning and Definition of Find definitions for: For•mo•sus Pronunciation: (fôr-mō'sus), [key] — n. a.d. c816–896, Italian ecclesiastic: pope 891–896. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Formosa Strait form stop Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language